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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba92394dbd85542bd8a58bb07d8a4ab60149c1c22766bf37ffe2afbdb9cde168' 
  AND token = 'nqtD9VCb0eTByQeouBOtlwJdHu1L860EFDPrVOl9ISY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}